WATCH: Berkeley Scientist Caught on Video Poisoning Female Co-Worker

Chemical engineer David Xu was caught on video poisoning his colleague Rong Yuan with cadmium over nearly two years, causing her severe health issues like vomiting and hair loss. Yuan discovered the poisoning after her mother noticed an odd smell from her water bottle, leading her to set up a hidden camera. Xu pleaded guilty to poisoning and received two years of probation, with his felony conviction later expunged.

• David Xu, a chemical engineer, secretly poisoned his colleague Rong Yuan with cadmium for nearly two years.
• Yuan suffered from unexplained vomiting and hair loss for two years before discovering the poisoning.
• A hidden camera captured Xu pouring cadmium into Yuan’s water bottle.
• Xu was charged with premeditated murder but pleaded guilty to poisoning, receiving two years of probation.
• A judge recently granted Xu’s request to have his felony record expunged, despite objections from prosecutors.